Think about the properties of different types of quadrilaterals .

Look for perpendicular lines in the shapes.

Think about the properties of different types of quadrilaterals .

Recall the properties of an equilateral triangle.

Recall the properties of an isosceles triangle.

Polygons are closed shapes made up of edges.

Recall the properties of squares.

How many sides does a quadrilateral has?

Heptagon is a seven sided regular polygon.

Total sum of all the angles of a triangle is 180 .